Hey, so I wanted to post this in case anyone has run into the same issue I have. I recently got a 4K TV, and whenever I tried using my Hauppauge HD PVR 2 (Gaming Edition) with it I would get no audio output on my TV. I tried just about every setting in the Capture software, reinstalled everything, but had no luck. I would have audio just fine on my PC, but nothing would pass through to the TV.
Well by chance I disabled the HDR setting on my TV (the setting is called HDMI UHD color on my Samsung TV), and what do you know, now all of a sudden I have audio on my TV!
I hope this can help you if you’ve had a similar problem.
Best of luck!
avideogamelife 
I’m definitely gonna try this out when I get the chance. I was trying to set the pvr 2 up today and it was driving me insane.
I also have a 4k hdr TV, the Sony x800d if you’re familiar, and even after I figured out some initial bugs I just could not get the audio to work.
Another thing to figure out is how to record myself talking with friends online but my buddy told me you can bypass this issue with PS4 share by using game chat so hopefully that will work.
Anyway thanks for the tip I haven’t seen this one mentioned yet.